mattresses are a real personal choice. Some like them very firm and others softer than a cloud.

When I first got married I had just gotten of being stationed on a destroyer for 4+ years, those mattresses were 2" of foam rubber atop a steel locker, very firm. I used to sleep on the floor because every civilian mattress was way too soft. Now I sleep on one of these medium firm type of mattresses.

So if you want to know what other's sleep on ask them for a suggestion. If you want to know what you want to sleep on you are going to have to test mattresses at the mattress store.

But this is what I sleep on and I like it.

https://www.amazon.com/gp/product/B00EZ5TB6U/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1